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W. W. D. JEFFERSK MAGHINE FOR PREPARING PAP-ER PULP. No. 371,760.

Patented Oct. 18, 1887.

Witmeooeo UNTTED STATES PATENT OFFiciE.

WALLACE W. D. JEFFERS, OF TIGONDEROGA, NEWV YORK.

MACHINE FOR PREPARING PAPER PULP.

$PECIPICATION forming part of Letters Patent No. 371,760, dated October 18, 1887.

Application filed February 17, 1887. Serial No. 227.965. (No model.) i

To all whom it mdy concern.-

Be it known that I, WALLAoE W. D. JEF-' FERS, a citizen of the United States, residing at Ticonderoga, in the county of Essex and State of New York, have invented certain new and useful Improvements in Machines for Proparing Paper-Pulp; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawing, and to the letters and figures of reference marked thereon, which form a part of this specification.

This invention relates to certain improvements in machines for preparing pulp for paper-machines; and it has for its objects to provide an enlarged feed for such machines and to more thoroughly and uniformly disintegrate the pulp, as more fully hereinafter specified. These objects I attain by the means illustrated in the accompanying drawing, in which is represented a longitudinal vertical section of my improved machine.

Referring to the drawing, the letter A indicates an oblong trough having straight, upright, or curved sides and curved ends, as indicated by the letter B. The said box or trough is provided with a longitudinal midfeather, 0, above the rear end of which is located the disintegrating-roll D, the periphery of which has a rasping-surface, as in the ordinary machines of this class.

The letter B indicates the usual fixed bottom plate, which is also provided with a similar surface,which operates in conjunction with the surface of the roll to rasp and disintegrate the material to be pulped. Over the roll D extends a semi-cylindrical hood, E, and to the rear, and secured to the said hood, is secured asimilar hood, F, whichis flanged and connected to the rear flanged edge of the trough, as indicated by the letter Gin the drawing.

The mid-feather G is provided with an upward rear extension, H, which is segmental in shape, so as to conform to the periphery of the roll D, the said extension terminatingjust below the juncture of the two hoods above mentioned, so as to form a throat or passage, I, for the disintegrated pulp and water. The midfeather extends forward toward the front of the engine, terminating at a point indicated by the letter K, and is so located as to leave a space or passage, L, between it and. the botmeans of apertures R, and which is designed to collect the heavy impurities in the flowing pulp.

The operation of my invention is as follows: The material to be pulped. is admitted at the forward end ofthe trough,which, it is observed, is extended in its area, so as to permit perfect freedom infeeding, and also bears such relation to the disintegrating-surfaces between the roll and stationary plate as to permit the use of a clearing rod or tool in case the passage should become clogged. The pulpis carried along by the draft created by the pulping-roll in the direction indicated by the arrows. The pulp is carried over the upper end of the upwardly-curved extension H of the-mid-feather at the rear into the throat or passage I, and by its sup'erincumbent weight causes a continuous circulation in the direction of the arrows, which is kept up until it is thoroughly prepared. As the opening through which the feed is effected is large in area and the midfeather is directly below said aperture, it will be seen that the stock can be fed in in large quantities and the operation of mixing, tinting, and other manipulations watched and regulated with accuracy. The weight of the material, moreover, instead of causing it to work to the sides or ends of the trough, causing friction, causes the pulp to drop quietly, and permits the heavier portions to collect at the bottom and work out into the trap for the purpose, thus producing a much better character of pulp than heretofore.

Having thus described my invention, what claim,and desire to secure by Letters Patent,

1. The combination of a trough of a paperpulp machine, the disintegrating-roll, the stationary plate, and the mid-feather having an' upwardlycurved rear extension, H, which forms a passage-way for the pulp between it and the rear end of the trough, the said midfeather also having a forwardly-extending fiat portion, upon which the stock to be disintegrated is fed, and being so located in the trough as to leave a passage-way below it for the circulation of the pulp, substantially as herein described.

2. The combination of the trough having its ends curved, the disintegrating-roll, the stationary plate, the mid-feather having a forv wardly-extending fiat portion and also an upwardly-curved rear extension, H, which forms a curved passage-way between it and the rear curved end of the trough, and the curved and connected hoods inclosing the rear portion of the machine, the said mid-feather being so located as to leave a passage-way beneath it, substantially as described.

3. The combination, in a stock-disintegrating machine, with the trough A, of the mid- 1 feather 0, located therein and adapted to receive the stock as it is fed to the machine, the water-supply pipe and valve arranged above the horizontal portion of the mid-feather, the disintegrating-roll and stationary plate, the curved rear portion of the mid-feather, and the'connected hoods inclosing the rear portion of the machine, the whole constructed to operate substantially as specified.

In testimony whereof I affix mysignature in presence of two witnesses. 1 W. W. D. JEFFERS. Witnesses:

CHAS. D. DAVIS, CHAS. L. GooMBs. 

